As suggested at the end of Project 3, I experimented and made some notes in my sketchbook of different sample marks.
The effectiveness of different styles of marks differ depending on the media being used. I tried out using graphite pencil, pen, felt tip pens, pastels and colour pencils.
I also tried various patterns based on Zentangle designs, which could be used with varying effect for creative shading and backgrounds. Different patterns have different tonal values.